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1. 发明授权

US4198675A Linearization technique for closed-loop acousto-optic modulators 失效
标题翻译：闭环声光调制器的线性化技术
公开(公告)号：US4198675A
公开(公告)日：1980-04-15
申请号：US907703
申请日：1978-05-19
申请人： George S. Moore
发明人： George S. Moore
IPC分类号： G02F1/11 , G06G7/20 , G01J1/32 , H04B9/00
CPC分类号： G02F1/113 , G06G7/20 , G02F2203/19
摘要： Linearization of a closed-loop acousto-optic modulation system is maintained over a uniform closed-loop bandwidth that is independent of the output light intensity level through the use of a compensating square-root function generator which employs the third quadrant characteristic of a MOSFET. The MOSFET may be connected as the feedback impedance of an operational amplifier which provides the square-root gain control function for complementing the non-linearity of the acousto-optic modulator. By utilizing the third quadrant characteristics of the source-to-drain voltage relative to the drain current of the MOSFET, the square-root function generator has a transfer function which insures that a linear relationship between modulator output light intensity and input signal current can be obtained irrespective of light intensity.In accordance with a preferred embodiment of the present invention, the operational amplifier of the square-root function generator may be supplied with an offset voltage in order to insure that the desired square-root transfer function can be attained regardless of differences in the manufactured characteristics of the field effect transistors that may be used. Temperature compensation circuitry may also be adopted as part of the square-root gain control component of the system to counteract the temperature sensitivity of the MOSFET's square-root current-voltage characteristic.
摘要翻译：通过使用采用MOSFET的第三象限特性的补偿平方根函数发生器，闭环声光调制系统的线性化被保持在均匀的闭环带宽上，该带宽独立于输出光强度级。 MOSFET可以作为运算放大器的反馈阻抗来连接，该运算放大器提供用于补充声光调制器的非线性的平方根增益控制功能。通过利用源极 - 漏极电压相对于MOSFET的漏极电流的第三象限特性，平方根函数发生器具有传递函数，确保调制器输出光强度和输入信号电流之间的线性关系可以是无论光强度如何。根据本发明的优选实施例，可以向平方根函数发生器的运算放大器提供偏移电压，以确保可以实现所需的平方根传递函数，而不管制造特性的差异如何可以使用的场效应晶体管。也可以采用温度补偿电路作为系统的平方根增益控制部件的一部分，以抵消MOSFET的平方根电流 - 电压特性的温度灵敏度。

2. 发明授权

US4198701A Digital optical recorder-reproducer system 失效
标题翻译：数字光记录仪 - 再生器系统
公开(公告)号：US4198701A
公开(公告)日：1980-04-15
申请号：US908726
申请日：1978-05-23
申请人： Brad R. Reddersen , Richard G. Zech , Howard N. Roberts
发明人： Brad R. Reddersen , Richard G. Zech , Howard N. Roberts
IPC分类号： G11B7/004 , G11B7/14 , G11B20/12 , G11B20/16 , G11B27/32 , G11B27/36 , G11C8/00 , G11C13/04 , G11C11/42
CPC分类号： G11B27/32 , G11B20/1217 , G11B20/16 , G11B27/36 , G11B7/004 , G11B7/14 , G11C13/048 , G11C8/005 , G11B2220/2537
摘要： A mass archival optical recording and reproduction system includes a recording light source such as a laser beam focussed and directed upon an acousto-optic linear modulator array (or page composer) that receives parallel blocks of data converted from a serial stream of digital data to be stored. The page composer imparts to the laser beam modulation representative of a plurality of parallel channels of data and through focussing optics downstream of the page composer parallel arrays of optical spots are recorded upon a suitable recording medium such as a photographic film floppy disc. The recording medium may be substantially frictionlessly and stably positioned for recording at a record/read station by an air-bearing platen arrangement which is preferably thermodynamically non-throttling so that the recording film may be positioned in the path of the information-carrying light beam in a static or dynamic mode.During readout, the page composer is bypassed and a readout light beam is focussed directly upon the recording medium containing an array of previously recorded digital spots, a sync bit, data positioning bits, and a tracking band. The readout beam which has been directed through the recording medium is then imaged upon a photodetector array, the output of which may be coupled to suitable electronic processing circuitry, such as a digital multiplexer, whereby the parallel spot array is converted back into the original serial data stream.
摘要翻译：大容量档案光学记录和再现系统包括诸如激光束的记录光源，其被聚焦并引导到声光线性调制器阵列（或页面编组器），该声光线性调制器阵列（或页面编组器）接收从数字数据的串行数据转换的并行数据块，存储。页面作曲者赋予代表多个平行数据通道的激光束调制，并且通过页面组合器下游的聚焦光学器件将平行的光点阵列记录在合适的记录介质如照相胶片软盘上。记录介质可以基本上无摩擦和稳定地定位，用于通过优选热力学非节流的空气轴承压板装置在记录/读取站处进行记录，使得记录膜可以位于信息载带光束的路径中在静态或动态模式。在读出期间，页面组合器被旁路，读出光束被直接聚焦在包含先前记录的数字点，同步位，数据定位位和跟踪带的阵列的记录介质上。已经被引导通过记录介质的读出光束然后被成像在光电检测器阵列上，该光电检测器阵列的输出可以耦合到合适的电子处理电路，例如数字多路复用器，由此平行光点阵列被转换回原始串行数据流。

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